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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 noudi03 7695
#2 KaneDy 2100
#3 ZM_J 1700
#4 anmichi 1625
#5 hfour 1585
Recent Solves
Great Snakes goPHISH
Finding Flags goPHISH
You either know, XOR you don't ZhenhaiTu
Favourite byte ZhenhaiTu
XOR Properties ZhenhaiTu
Recent Solutions
XOR Properties qqqwww 0
Favourite byte qqqwww 0
Greatest Common Divisor MaximCTF 0
ECB Oracle Kredsya 0
No Random, No Bias zenobia 1

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